ADU DEVELOPMENT STANDARDS.
Oxnard City Code § 16-465.7
in effectSEC. 16-465.7. ADU DEVELOPMENT STANDARDS.
The following development standards apply to ADUs not meeting the requirements of Cal. Gov’t Code Section 66323:
(A) Maximum size.
(1) The maximum size of a new attached ADU may not exceed 1,200 square feet or 50% of the total floor area, including attached accessory buildings or structure, of the primary single-family unit, whichever is less, determined by gross floor area of living space; however, shall not preclude an ADU of 800 square feet or less of interior livable space with four-foot side and rear setbacks.
(2) The maximum size of a detached ADU determined by gross floor area of living space is as follows:
(a) 850 square feet of interior livable space, if one bedroom or less;
(b) 1,200 square feet of interior livable space, if more than one bedroom.
(B) Minimum size.
(1) The minimum size of an ADU must be no less than the minimum size necessary for the creation of an efficiency unit consistent with the meaning of Cal. Health and Safety Code Section 17958.1.
(C) Maximum height.
(1) The maximum height for attached and detached shall not exceed two stories and 25 feet.
(2) Existing legal structures converted into an ADU may maintain the height.
(D) Setbacks.
(1) The front yard setback is the same as the underlying zone.
(2) The minimum of four feet for rear and side yard setbacks.
(E) Interior yard space.
(1) Same as the underlying zone. Standards shall not prohibit an ADU of 800 square feet or less of interior livable floor area and has four-foot side and rear yard setbacks, provided the ADU complies with all other applicable standards of this chapter.
(F) Additions to historic structures. A building addition to a designated historic resource or potential historic resource, as defined in Chapter 16.42 (Historic Preservation), for an attached ADU shall be inset or separated by a connector that is offset eighteen inches or more from the parallel side or rear building wall to distinguish it from the historic structure.
(G) Historic resources. Detached ADUs on any real property listed in the California Register of Historic Resources must meet design standards meant to prevent adverse impacts on any real property listed in the California Register of Historical Resources. Where this section uses the term "consistent", that shall mean to be compatible and similar to that of the resource but not precisely the same for the purpose of complying with the Secretary of Interior's Standards for the Treatment of Historic Properties. Standards shall include, without limitation, the following provisions:
(1) Architecture. The ADU shall match the primary residence architectural style. Two or more architectural details such as, but not limited to, materials, window style, trimming, and/or decorative pendants/brackets shall be incorporated into the ADU with a simplified version. An example of a simplified version would be composite windows as an acceptable alternative to wood if they simulate the texture, appearance, and finish of a wood window.
(2) Color. The ADU shall match the color(s) of the existing primary residence.
(3) Roof. Roof style and pitch shall match the primary residence.
(4) Location. Newly constructed attached or detached ADUs shall be located behind the primary residence as viewed from the primary front lot line; however shall not preclude an ADU of 800 square feet or less with 4-foot side and rear setbacks in compliance with Section 16-465.5 (Cal. Gov’t Code Section 66323).
(Ord. No. 3072)
Source: City of Oxnard, California, City Code (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/oxnard/latest/oxnard_ca/0-0-0-88517Fetched: 11/8/2026